Radio communications
AssigneeNordic Semiconductor ASA
InventorJoni Jäntti
Life of this patent
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Abstract
A radio receiver device comprises an analogue-to-digital converter clocked by a first clock signal which receives a radio signal. A digital circuit portion receives a digital signal produced by the analogue-to-digital converter and comprises digital processing units clocked by a second clock derived from the first clock and which produce an output signal at an output sample rate. A counter clocked by the second clock counts samples at the output sample rate. A network timer clocked by a reference of a network clock produces a receiver enable flag synchronised to the first clock. The counter is enabled when the flag is set and sets a trigger flag when the count exceeds a predetermined threshold. A buffer receives the output signal and is enabled when the trigger flag is set.
Claims15
A radio receiver device arranged to receive a radio signal modulated with a plurality of data symbols from an incoming bitstream, said radio receiver device comprising:
- an analogue circuit portion for connection to an antenna, said analogue circuit portion comprising an analogue-to-digital converter clocked by a first clock signal, wherein the analogue-to-digital converter is arranged to receive the radio signal and produce a digital signal therefrom;
- a digital circuit portion arranged to receive the digital signal produced by the analogue-to-digital converter, said digital circuit portion comprising:
- one or more digital processing units, clocked by a second clock derived from the first clock, said one or more digital processing units being arranged to process the digital signal and produce an output signal therefrom at an output sample rate;
- a sample counter clocked by the second clock such that the sample counter counts a number of samples at the output sample rate, said sample counter being arranged to set a trigger flag when the number of samples exceeds a predetermined threshold value;
- and
- wherein the radio receiver further comprises a buffer arranged to receive the output signal from the one or more digital processing units, wherein storing of samples to said buffer is enabled only when the trigger flag is set.
A method of operating a radio signal modulated with a plurality of data symbols from an incoming bitstream, wherein the method comprises:
- receiving the radio signal;
- converting the radio signal from analogue to digital, thereby producing a digital signal from said radio signal;
- processing the digital signal and producing an output signal therefrom at an output sample rate;
- counting a number of samples at the output sample rate;
- setting a trigger flag when the number of samples exceeds a predetermined threshold value;
- enabling storing of samples to a buffer arranged to receive the output signal only when the trigger flag is set.
Dependencies are inferred from the claim text.